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What Is a Crystal ?
Crystal is the solid form of a substance in which the atoms or molecules are arranged in a definite, repeated patterns. The formation results in one of three ways: a liquid may cool or freeze into a solid; dissolved matter may precipitate out of a solution; or gases may condense into a solid form. The external shape of the crystal -- smooth, symmetrically arranged, flat surfaces -- reflects its atomic structure.
The most common crystal in photography is snow, but there are many other crystals around us and they can all be beautiful.
One of the surprising aspects of crystal is the variation of their size. One single crystal can measure a few nanometres or up to several meters, like in the famous cave of Naica. In the following pictures it is possible to observe that crystals can have the same shape at different scales.
Pictures via wikipedia and sweet random science.